I woke up today to find my male betta floating up near the top of the tank. Part of his body is a little above the water. He seems a little sluggish but he still swims in bursts. He seems to be having issues staying down under the surface. He's just swimming directly under the surface. When he dives, he just kind of bobs up. He doesn't look bloated or anything although I think he might have a mild case of fin rot.
My wife changed his water yesterday so I believe the amonia levels should be okay.
He doesn't appear to be having any problems breathing. His gills aren't moving fast.
Any idea as to what's going on or could he just like hanging at the surface?

I don't think it's Swim Bladder Disorder. He's not upside down. He doesn't appear bloated (at least to my eyes). No curved spine. No swimming with the tail above the head.
It's just his dorsal fin that's above the surface. He seems to be swimming around fine, with plenty of his usual energy, he's just at the surface all the time.
He's swimming down and shoving himself under stuff to keep himself from floating up.

I don't think it's Swim Bladder Disorder. He's not upside down. He doesn't appear bloated (at least to my eyes). No curved spine. No swimming with the tail above the head.
It's just his dorsal fin that's above the surface. He seems to be swimming around fine, with plenty of his usual energy, he's just at the surface all the time.
He's swimming down and shoving himself under stuff to keep himself from floating up.

If I remember correctly any bouancy issues is related to SBD..when they cannot keep from floating to the top..you can check with Old Fish Lady..or Sakura..they can help you best..I have never dealt with a fishy with SBD but have seen some members with fishy's that have the same symptoms. You can PM either one of them for help..Good luck